Browning Receiver XTL Crystal 4.670 CH#19, Browning part number is 16-0061. These are Original Browning crystal use in Mark III Receiver in the XTL positions to give it a fix receive frequency. If use in a Mark IV/IV it will receive on CH# 7. Mark III and earlier formula is first mixer crystal frequency minus XLT crystal frequency plus .455 IF frequency. For Mark IV/IVA it is first mixer crystal frequency plus XTL crystal frequency minus .455 IF frequency. IE: 22.820 + 4.890 - .455 = 27.255 or 31.400 - 4.890 + .455 = 26.965. If wired for a different first mixer crystal in the XTL position you can get other fix receiver frequency. Make sure you radio has not been modified before ordering these to make sure you radio is still set up to use them.

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